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Best cruising RPM? Best speed for max MPG?

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Old Dec 16, 2004, 06:56 PM   #1
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Question Best cruising RPM? Best speed for max MPG?

What are you peoples thoughts on best cruising RPM for max MPG as well as speed? I am going to be making a 10 hour trip next week and want to know where would be the best place to keep my RPM? 3000? 3500? I'll be going about 80-85 MPH the whole way (except in Oregon ) Thanks.

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Old Dec 17, 2004, 12:41 AM   #2
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Staying around 65 in fifth gear seems to be the best on mileage from what I've found. Anytime I go over 70 for an extended period my mileage drops off a bit. On a tank of gas doing mainly highway miles @ 65 I usually average well over 300miles per tank.

Besides, at 80-85 mph, you don't want to be cruising in any other gear than fifth. If you're worried about mileage, best just keep a steady speed and keep it in fifth.
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Old Dec 17, 2004, 12:42 AM   #3
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if you have boost gauge, just make sure you stay out of boost.
(maybe i should read that this is a lancer forum, and not an evo forum. sorry lancer guys) anyway, about 65 should be good.
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Old Dec 17, 2004, 01:07 AM   #4
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^ I wish I had a reason to have a boost gauge Thanks for the responses.
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Old Dec 17, 2004, 07:46 AM   #5
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Most cars are designed to acheive maximum fuel economy at around 60 mph (the way the gearing/RPM is set up, etc.)

Once you get into the 80-85 mph range, your MPG will go down (naturally - higher RPMs).

If you want to buy the least gas, keep it closer to 60-65. But if you're like me, you'll drive 80-85 because you want to get there sooner.
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Old Dec 17, 2004, 07:48 AM   #6
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[QUOTE=McCow]Staying around 65 in fifth gear seems to be the best on mileage from what I've found. Anytime I go over 70 for an extended period my mileage drops off a bit. On a tank of gas doing mainly highway miles @ 65 I usually average well over 300miles per tank. QUOTE]

damn i want 300 miles per tank...my average is like 245 miles =( ...but stop and go traffic loves me =/
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Old Dec 17, 2004, 02:54 PM   #7
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hahah finally an area of my expertise since I drive home from college ALOT... well heres the think watch those RPMs cause theres a dramatic lost in gas milage as soon as you hit say ~81-82 mph. aslong as you keep the rpms below say 3300 you're doing pretty good. Ive done a few trips keeping steady at 3000 rpms but thats just to slow. Id cruise right at 79 mph. Better gas milage and less chance of a ticket. Only goind 9 over the limit greatly reduces the odds of getting pulled over and if you do the fines way cheaper and no points. Just alittle FYI
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Old Dec 17, 2004, 04:16 PM   #8
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damn, i'm averaging about 420 miles per tank. mainly highway. on city streets, i'm usually about 340 a tank.
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Old Dec 17, 2004, 04:21 PM   #9
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Quote:
Originally Posted by wingnut17
damn, i'm averaging about 420 miles per tank. mainly highway. on city streets, i'm usually about 340 a tank.
How is that possible with all your mods?! That's amazing. Where do you live? I'm at 3600 above sea level and the best I've ever gotten in 2 years is ~340 miles.
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Old Dec 17, 2004, 06:11 PM   #10
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I run my car until my light comes on, once my light comes on, then i run it for 70 more miles then i fill up. i usually end up having to put in about 12.5 gallons. i calculate my mpg every tank. I'm usually between 36.5 to 37.5 mpg. The best i've gotten is 39.752 mpg. That was 500.9 miles on 12.600 gallons. i live west of pittsburgh. its mostly all highway miles and i drive with cruise set at 65 mostly. I'm just lucky I guess.
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Old Dec 17, 2004, 06:12 PM   #11
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i also don't floor it from a stop. i usually shift around 3750 rpms.
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Old Dec 17, 2004, 06:18 PM   #12
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z lancer u should of kept that piggyback you sold to me...i get about 330-360 a tank with a mix of highway and city...and i dirve about 80-85 on the highway....
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Old Dec 17, 2004, 06:20 PM   #13
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anything over 65mph and the wind resistance on the car increases exponentially. so 60-65 and you'll get the best fuel economy for the highway.
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Old Dec 17, 2004, 11:23 PM   #14
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If you plan on driving 80-85 mph, you don't really get a choice. I think that puts you around 3500 in 5th gear, and definitely don't want to drop down to 4th. Slightly related, I get an average of about 28-32 mpg shifting at 3500 and cruising around 3000. I used to shift around 3000, and got a few mpg less. I'm not a lead foot, but I'm definitely not getting 35+ like some of these guys.

Oh, and for what it's worth, I got less than 10 mpg driving 120 mph from Los Angeles to Tuscon, so what they say about wind resistance and the car's efficiency must be true!
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Old Dec 17, 2004, 11:32 PM   #15
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i find that if i wanna cruise doin 80-90mph for a trip to vegas or something, if i run 91 octain and add an octain booster like STP and also happen to be running a synthetic oil, i get waaaay better gas mileage at higher rpms due to burning cleaner, that or its all in my head, your call
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